<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>右上右下圆角,左上左下直角</title>
    <style type="text/css">
        #box1{
           width: 50px;
            height: 30px;
            background-color: blue;
            border-radius: 0 10px 10px 0;
        }
        p{
            color: white;
            position: relative;
            left: 9px;
            top: 3px;
        }
    </style>
</head>
<body>
   <div id="box1">
       <p>圆角</p>
   </div>
</body>
</html>